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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e6f857b4f30098aae2e4c7ced32be91b291e9a387c68bbde1501cfb64ebdeb9' 
  AND token = 'AOdT784Ja/QjBmU9b2uiVYEbkuRBntLrb1ErmfgFe14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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