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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d2f576665612394a7d3187408303844bc71575c7789a51456de0b64165c6467' 
  AND token = '13bi17ezc2xurSebleu9iuF7Q+CC15fg3C0Gzk9xqg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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