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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dc01dc529c0e66b55ce220a996b19eeb0caff8ea0afc488be2d7d33b8ffc28c' 
  AND token = '/D7Nlh/7+TiUUgaR+D8AE/lHSs16st6nrI7NjsNSqYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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