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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aac5413741c953935bc6ecf26b5099f830990ab53953808f9fe1fb441a595b53' 
  AND token = 'VSvg7BP/ac1M/1/QrazHMI0PQEORtIy8cbQLsxST1Ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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