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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d8824af57de4b8dfc4cf54b495c8beb3f5f8e012df511f0a9f37d55ee004d92' 
  AND token = 'r1Tt+9QIovhfQindWBKDT/5Synx6F/564AqKS6gkylM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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