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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdf55edc17cbf383bd07204a22823620c1a3fb72d54d77e98a912ed05cea0c2e' 
  AND token = '6fQxiRqcfEdqHszO+aA85DMFIeTVErqJ98NYkbU/RfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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