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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b9d470d2a8dbe83fd281849a4f4ccd1a63bcf0e7675950fe361f4ee3b5ea6d0' 
  AND token = 'R5rQPJT/CciVMnp8U7ZmBIsXGdMbdB0Hyi2ZtgocOTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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