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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '236b662becaea9a68e204c883a3aaa518e33d63f6da1751b0054b3e081aeed75' 
  AND token = 'JZATTYR5bz3apS6F7YgQVe7tCQiXF8IQq3duW7ejxp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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