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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '342889fec94418a9040a2e04a7cccde9effaf25d5ae2949f22897fb068d55079' 
  AND token = 'WiMH1gLgnVhVsiDpqVY7ljBtGE6lLSdexplItTh/w0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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