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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c24f652f222c4578d5eeff0e0d148f25fcdad301d1c066a0f862b475c3287b96' 
  AND token = 'AR8wni6blVibhSO3VPkn7TjlWP/8n+cwLaCEW4MFH9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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