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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86ce7207e34ac0c1caf33de9511b853c906eba6a54c66c3f271a76a99a35d519' 
  AND token = '7nUBoZ9z52usBmLSXH2iEe49NAIn9m2LWfm/wl92vO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00088

JSON explain

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