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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb5c958ea9a9ce8ac9d3238ff84cf1637486e1f4833837915587443915d2f00f' 
  AND token = 'L+ABfdN/P37sa7js7PjjpewNonck3ISMlrl8ieFpLeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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