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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddbe3cd6bcd424f0c1472813a3c9dfba49aa22d02e731f880e1ecd5a73e13c2d' 
  AND token = 'SgxVxJY86vVCLGJCxjuwLBuBbi4hujt4S2hciUeg0Dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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