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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16294da3f64bbfd9de0618d03ead38fb3b879d463ab53aba5787c44e5a9ec35f' 
  AND token = 'BJEMMYatnK/Z9Ve4fE15Ez1to261rwTNb/mnw55ZtfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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