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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa65e563b6c82dc09b5cb978653a79d6657c40c1e1f8b8c258e1e9eed7be3035' 
  AND token = 'iAvUyptYV+cQvTBjjLnAyJf4ZVxohxvrr8V4j/JX0FA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

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