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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '700db2743604b80a443a12e741a15bca9b46e1acb823be445e35d9f1ed5a8512' 
  AND token = 'zlBVVlH0Uj9IPzZ2q1q6IWIHrV/RT65Zz+ebyZQz7hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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