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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb3f7143daf472fc16f094e5cdee758a61f841bc02b283bf58b9ff5e91d8a8a1' 
  AND token = 'ommOhtNA94m6QlaO/jexBY4FuvBHBy+2bEunHF5Ii2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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