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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a05b5b90619954f84f32fc595c4dcd0b28663a6e710765866ceb9f6309548ec' 
  AND token = 'Ff8NFw2mws1YAF9noznnESjpmDhU23pM71wGRAHW+T4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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