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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '354361fcf34072d6d9ed033702d533efdd202e52b5fac11fe878852070a8a4d4' 
  AND token = 'G3ZFFht5D4juNS2mns3q7Uc1RLjpH8c0RCo6NDAuilM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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