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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6235e966d2341d3595e1c71ea109a8eb3c9cde30edf81f7ea1a5c122d1ee4711' 
  AND token = '5dqzYkKyLas4dJVL8JyA9NmkbbYABOuEVHU/BYoVrJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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