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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dddd7016579e20a32c521324d68eaff3f882e81a2fc93b0d028d08ef598848d2' 
  AND token = 'Qv5sOibKSut+0czlvhkiWC014ZQewR9Hr7B+XoXBaHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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