SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '233770731595f27aa687429233c51cc9e89f86357a3f2d33441078f07b18bc31' 
  AND token = 'Ps2Sa6qgJeBy/53w7hIMzswmwiQAHyKGlw0WYg73V2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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