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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fd72f8bbdcc27baf8e61930b2bd10b198680fbf9c4ce660918434a36e35a72b' 
  AND token = 'dg5guOS0BN3Op/96z7Lz2OnrV8CHAcT+PmoTIpjAmck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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