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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33ef0f32dc5566a10a46a770ad7bf627742d4037dee3cf62d442af67b5a567fe' 
  AND token = 'RhPwYSZ0OpB1ossaiNx28cnO8M04pItNQsl6LxzeoUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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