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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ab902fa4c695eb3715ff95541d7b9a3595e16443121c0844dad19697d3ad9e3' 
  AND token = 'X9OESOl/WYS+w7C8kHu7ZgxGbumJb000OOLRLdxJ+iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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