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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2812a85376eb1b442930727dcc7e616c62f8e90ed3081d6940c7a3d667edc9cf' 
  AND token = '1/Q+oziRC11Euo6nKstXN6yRRf19EABW5mPJOAUr0bU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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