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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40d3d38e1202a1a344412f5030c44bd9dc8fce79fa58612d3b5089eb5f623cfe' 
  AND token = 'rTUgsxOREm1LnvPCg0m6vWf0rv3xfxO/5jUf/kFyJrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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