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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14cb2ea650d6adc8d5c15a7b8f6e753e1a4474b881737f7e3f5fd8082583257c' 
  AND token = 'XzUB54fc5e0vjaoCi0Bzfvuh/ibds3gOM377GlVgXFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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