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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9fbcc52046fd916418740936456ca5b15dbde6c5cc757af67d030e9e9fdb65e' 
  AND token = 'RdFO6AIz5KQxf0q7OL+FQXJ+jZCVhUR0xfvWWQEG25o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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