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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4127d9c04678b0487c1e1872ae0cbe1906c8a4c85d60df27f9b1ea1b95e93b5f' 
  AND token = 't3pLBlsznHnu+tnDNSFq8JDQOll6Hk+3CrA3hd25SSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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