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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a2a2311704f5700f24eff44be6fd1fe51fb3924d11e4d229be7f8ad434a3714' 
  AND token = 'xbaha8cox+R4jgNhIm/cr3oLvElvgrASJXcaHbUam70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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