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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7f7554e7596f249e454dfe6943c9c3d7dc21fcee2dafc8d7cff4f5946622222' 
  AND token = 'XPH7kl46kkrZ0D9lGGYmH9OhtOeQMoUi1x0iEd2rHsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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