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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecea3c4465429708fdba4672fe3df41acb129ab4b56ecf5ff334ae777dbff265' 
  AND token = '3Hk62AX7lTDkb6kg4kouDgdd4Ypr8AwHtj/rB+STmpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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