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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '736c1475035e65c7c40e9f1715daa8aa88edc9fe2a3f7403355b8ac655df9692' 
  AND token = '4vC/QFvkON/51crFbqEZaculpEZ/4NssuM9HQ7cCdWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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