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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '245f6c7cf4644c1786a91e9641e397f9896525692727c1543b1e7c67686b89f0' 
  AND token = 'X+JNHqxkOMQY1NWK97nG0oQ3/d6g8CDYmWRySAHa4+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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