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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69668fec427d189fc5f6014804f7dda6227bda80a92c432fb46791a2827bc4b0' 
  AND token = 'UFSW78cww6H06Iy59TbCqO04Zq6becjZfSGniAAXsGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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