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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20725918dd0f1f422dc64625c8280564b380f64e6e98c5de26f9adaf52b79c39' 
  AND token = 'izx4pk+7oC8LkmMWGzD4QjkP/SLhXzeciTwHzTijf38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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