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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8182cc8335884742da8b5f61a84dec440a51ff1d93c071b2cc25038c4bb58be7' 
  AND token = 'aaiSJ0O9D/g6fm+msoMlKVGUSOV4+w3eU+XpREsKUaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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