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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6463eeeabbf655577a2ee0c352ff8132b346298a926b3c05fda71467f07389dd' 
  AND token = '5TUUI1n+Kjw+pzz+oYha4zXLP/N23w1xP5W6irctNMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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