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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aecd5e3757b8f296f56b06a85c5790384b71a70f630bf14ad954f1112cfeef7' 
  AND token = 'uDbHml9S0SdSRhhjkuaNsGwyyl8in4MJ4B+IlBe61DM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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