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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c508f34bfad133e16ca84316c8d0d89fb3749466655ef70ded4b09c594295ded' 
  AND token = '9O24G3fNSk/tz+GiFTSWwTuIXFeHxBvtiDlopi5zpdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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