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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58c32b78df467892d15293b857a5a7008a5d512e386e00d075b23b22cb88c4c9' 
  AND token = 'bOhT/A+ajqh7D59/mxRVO8WBqSAkRaszKAvOE4OLd9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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