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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48674ee4ab5220104046c0ba19d8be39fd1b20ac7225a2089cf112dc4efafc6d' 
  AND token = 'W04nqM3Z8fPPgVIY3T8fA9sTG6bx7RQBNCP+8oBNIbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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