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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c5bae0ae6d267c554c258c57c7f69ce7a43ba1a28976dbba5321528afdcf6e2' 
  AND token = '4nMWiTZjCXjUQakl/8sBxzlu4rnktuWgjuG3dH7sYA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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