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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '881c74d8bbcb7eae14eaa2b352d70b3247a4a92f071e1cc71b0bc65e6961933c' 
  AND token = '9QnRSQwB1VtYRPJGjGBAatyUz1OCxv4dHh1bTemhH6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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