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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc65474a9d93c0c234c3716ccaa5a108f3f9eab91b997a7d0fe8ddf934b6a092' 
  AND token = 'TQ/r36BE8D1IWTaMgcVFdZt/AoKP9+AG7GUkWGWH2B0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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