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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f31f11c70ad63658d7b6496ddc4c03601e6d5eae728a530735bc699d4cc164e' 
  AND token = 'nYiUPsmbolxATWmNyztCXwJNqfwnu2u1h6P9v4ROYIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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