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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92e7d2a192747f9935f76d0527fb592fa1c7a2f9c1f49edd98ea84f4a8d50efe' 
  AND token = 'RAMewYF2WFRHqcH6Ye9QikP3cP4w7zKHgsARFQGddT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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