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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18ccd0d508a8c28d1e24b856a1ecfb41c9592f67027bde567e8038f5e64d9e1d' 
  AND token = 'ENeIeA43TvsziizNPQra0wJ/avFspAF5wX0adKQ6Sn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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