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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e173c0383f7d6a7a9e2d896fdc3a3b11ebefff094d50429f46e0c6f9750ef22' 
  AND token = 'DRZiq3dKdr8vceamkh8imoIh9gkAx3z8ipUvTopx2d8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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