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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8d2c23a504751f477e2165ca9f884a786685a52b44cedd01e0002aecd532db0' 
  AND token = '8blDe7wuUJkuoRyFqdXLcc6NycHFX12Y8AOp3438fms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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