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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94aa7f9c19402efc670d5692efc4dbfb7ec9273e97d8bd944a29080a330cb225' 
  AND token = '0dXY27EdQGJfIAzxZ6Su2AqFpANwvzrs+E/zZceeF8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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