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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5748b95f802f03936ab6eba42b74a7c68f1fbf8e3e575716e404b2929d413681' 
  AND token = 'sijVuft7yAMxS4AJ7i4syT754MwrM45qyb7N2hmClsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}