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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4128115c254d36d8a385de6c726a7e47bf14ec0b2096a6a988cb1f1e26bc9025' 
  AND token = 'UM4q2SCaY//32tGDauf0dDFoPsIONUBBOJx4U1Fkkw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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