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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bedb5535db7c1afe6e8d2de2f6dfa503bef4555096541258a01bfd833f88d001' 
  AND token = 'v8FsXci7+3J68GAEJmOLAQTQKd4pO8uYEqKgl3fTF5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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