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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2f1d28465a94f213f45f9a762e13bf2060d877ad6efbf9556bdc0f57ec7547d' 
  AND token = 'Fi+yqg6TQ3vDbpnfeS3We6d0fK8/CSJnEcyK0Z753kU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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