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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fec060f54b1cd7253f1c89f5b689565ae46e7125f7a42d8e065f2bf0fed721cd' 
  AND token = '38EJuXxZgznmlLafSm+q08b6B5bUWQBT+gJe32zdJQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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