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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2aa89d3672fcddc1b6a15fd307eb408cbc03583e55a18a88c32a919f25d58fd' 
  AND token = 'ydLadoOrO/8uj3bRCkbHSIQejY3LbD7dkSeGJF1JrZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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