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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '053aa90f3b92b8bd1f9e20bed5c50a50d8b327127cbd5b128717ef99b2e6e014' 
  AND token = 'WtvKlOyRIre7FFR1P43Hbg3ebwTQKK4p4jAyAeOG4aU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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