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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe7608c0aae34a30aec5839808897b82a0f3a4ce6d49a01e70b7ae0886c91bfe' 
  AND token = 'yTlj3HVq+TPWqlYA52j+OJ2/vQ6ZEXRicCrNMlTbfhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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