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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd1df79086209ae4290f663b797d9d7dcf6593de290027ffd449f00e362dd413' 
  AND token = 'H1/HiqpEFElmwr9YK5tNLrsDIWuzt0zV/otKMp7CNac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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