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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f154d9ec41e17da71f2c8edff3b5ea53aefbb51bff6fc8800f3d0ffbc208d3a' 
  AND token = 'qQYwaM9BmEYe+pmAGRwsIwkmqmPhuQ3PFvy7c/bLY5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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