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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6e08e3d397c98d22bee7874c9a43a14c2c38f4cbb8c5b4ab34e81b882c9b5fe' 
  AND token = '3iBXkS+ellZjGu4QCbPaZkfer2Ty8Y/78wtZ7fkftYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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