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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eac83765256b3c3bcdf8aacd6765485381e3409be288c899e27793c925e35121' 
  AND token = 'FbjIG9ziWJpmAS2T2E0GZjhMtBclZ4rDUdH7aUYioh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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